问如何在bash中使用'readarray‘将文件中的行读取到2D数组中EN版权声明：本文为耕耘实录原创文章，各大...
问抑制Bash中readarray命令中的错误EN我正在解析AWS策略文档，并试图将此命令中的错误发送到/dev/null，...
array+=("$line")the line variable stores the value of each line in the file and using this argument, it gets stored in an array. done < "$file"instructs the loop to read the filename from the$fileusing the input redirection<. ...
The easiest and safest way to read a file into a bash array is to use the mapfile builtin which read lines from the standard input. When no array variable name is provided to the mapfile command, the input will be stored into the $MAPFILE variable. Note that the mapfile command will...
variable referencedbyname's value. The nameref attribute cannot be applied to array vari‐ables. -r Make namesreadonly. These names cannotthenbe assigned valuesbysubsequent assignment state‐ mentsorunset. -t Giveeachname the trace attribute. Traced functions inherit the DEBUGandRETURNtrapsfromthe ...
lowercase variablescmd |readbar;echo$bar# Assignments in subshellscat foo | cp bar# Piping to commands that don't readprintf'%s: %s\n'foo# Mismatches in printf argument counteval"${array[@]}"# Lost word boundaries in array evalforiin"${x[@]}";do${x[$i]}# Using array value as ...
read 命令 条件判断 循环 函数 数组 set 命令 脚本除错 mktemp 命令,trap 命令 启动环境 命令提示符 Shell 的含义 学习Bash,首先需要理解 Shell 是什么。Shell 这个单词的原意是“外壳”,跟 kernel(内核)相对应,比喻内核外面的一层,即用户跟内核交互的对话界面。
<4> 交互式数组值对赋值 read -a ARRAY_NAME 4、数组引用 引用数组中某元素的值: ${ARRAY_NAME[INDEX]} 注意:省略[INDEX]表示引用下标为0的元素 数组的长度(数组中元素的个数): ${#ARRAY_NAME[*]} ${#ARRAY_NAME[@]} 数组的中某个元素的字符长度: ...
# Usage: remove_array_dups "array" declare -A tmp_array for i in "$@"; do [[ $i ]] && IFS=" " tmp_array["${i:- }"]=1 done printf '%s\n' "${!tmp_array[@]}" } 用法示例: $ remove_array_dups 1 1 2 2 3 3 3 3 3 4 4 4 4 4 5 5 5 5 5 5 ...
When an interactive shell that is not a login shell is started, bash reads and executes commands from ~/.bashrc, if that file exists. This may be inhibited by using the --norc option. The --rcfile file option will force bash to read and execute commands from file instead of ~/....